Exposure of Sensitive Information in keycloak

published 2020-03-24 6 y ago modified 2026-06-17 4 mo ago also GHSA-4gf2-xv97-63m2 , EUVD-2021-1973

cvss: 5.6; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.1%; EPSS 1.1% chance of exploitation in 30 days, percentile 66%
public exploits: 0; none known

A flaw was found in keycloak before version 9.0.1. When configuring an Conditional OTP Authentication Flow as a post login flow of an IDP, the failure login events for OTP are not being sent to the brute force protection event queue. So BruteForceProtector does not handle this events.

Patch / fix

fixed in 2 distros 2

maven org.keycloak:keycloak-core 9.0.1
redhat keycloak 9.0.1

red hat opensuse

rh-sso7-keycloak red hat single sign on 7 4.8.18-1.Final_redhat_00001.1.el8sso
rh-sso7-keycloak-server red hat single sign on 7 4.8.18-1.Final_redhat_00001.1.el8sso
rh-sso7-keycloak red hat single sign on 7 4.8.18-1.Final_redhat_00001.1.el7sso
rh-sso7-keycloak-server red hat single sign on 7 4.8.18-1.Final_redhat_00001.1.el7sso
rh-sso7-keycloak red hat single sign on 7 4.8.18-1.Final_redhat_00001.1.el6sso
rh-sso7-keycloak-server red hat single sign on 7 4.8.18-1.Final_redhat_00001.1.el6sso

red hat advisories RHSA-2020:0947 RHSA-2020:0946 RHSA-2020:0945

ansible-14 openSUSE Tumbleweed 14.6.0-1.1
ansible-13 openSUSE Tumbleweed 13.7.0-1.1
ansible-12 openSUSE Tumbleweed 12.2.0-1.1
ansible-11 openSUSE Tumbleweed 11.11.0-1.1
ansible-10 openSUSE Tumbleweed 10.6.0-1.1
ansible-9 openSUSE Tumbleweed 9.8.0-1.1

opensuse advisories openSUSE-SU-2026:12447-1 openSUSE-SU-2026:10944-1 openSUSE-SU-2025:15753-1 openSUSE-SU-2025:15605-1 openSUSE-SU-2024:14536-1 openSUSE-SU-2024:14244-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-1744 updated 2026-11-07 cvss 5.6

keycloak: failedLogin Event not sent to BruteForceProtector when using Post Login Flow with Conditional-OTP

Red Hat OpenShift Application Runtimes keycloak keycloak Red Hat support for Spring Boot keycloak keycloak
affected: no fix available
Red Hat Runtimes Spring Boot 2.2.6
fixed: vendor fix RHSA-2020:2252
Red Hat Single Sign-On 7.3
fixed: vendor fix RHSA-2020:0951
Red Hat Single Sign-On 7.3 for RHEL 6 Server rh-sso7-keycloak 4.8.18-1.Final_redhat_00001.1.el6sso, rh-sso7-keycloak-server 4.8.18-1.Final_redhat_00001.1.el6sso
fixed: vendor fix RHSA-2020:0945
Red Hat Single Sign-On 7.3 for RHEL 7 Server rh-sso7-keycloak 4.8.18-1.Final_redhat_00001.1.el7sso, rh-sso7-keycloak-server 4.8.18-1.Final_redhat_00001.1.el7sso
fixed: vendor fix RHSA-2020:0946
Red Hat Single Sign-On 7.3 for RHEL 8 rh-sso7-keycloak 4.8.18-1.Final_redhat_00001.1.el8sso, rh-sso7-keycloak-server 4.8.18-1.Final_redhat_00001.1.el8sso
fixed: vendor fix RHSA-2020:0947
Red Hat Text-Only RHOAR
fixed: vendor fix RHSA-2020:2905
Red Hat Fuse 7 keycloak keycloak
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.12% chance of exploitation in the next 30 days, higher than 66% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.6	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
NVD	3.1	5.6	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
NVD	2.0	6.8	AV:N/AC:M/Au:N/C:P/I:P/A:P
GitHub	3.1	5.6	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

Affected packages

ecosystem	package	affected	fixed in
maven	org.keycloak:keycloak-core	<9.0.1	9.0.1

Affected products

Red Hat keycloak

Classification

Weakness

CWE-755 Improper Handling of Exceptional Conditions
CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

References

bugzilla.redhat.com /show_bug.cgi?id=CVE-2020-1744
web, issue-tracking, vendor-advisory
access.redhat.com /security/cve/CVE-2020-1744
web, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2020-1744
advisory
github.com /keycloak/keycloak
package

Sources

CVE List CVE-2020-1744
GitHub Advisory GHSA-4gf2-xv97-63m2
NVD CVE-2020-1744

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary